1 /* 2 * fixmap.h: compile-time virtual memory allocation 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1998 Ingo Molnar 9 * Copyright (C) 2013 Mark Salter <msalter@redhat.com> 10 * 11 * Adapted from arch/x86_64 version. 12 * 13 */ 14 15 #ifndef _ASM_ARM64_FIXMAP_H 16 #define _ASM_ARM64_FIXMAP_H 17 18 #ifndef __ASSEMBLY__ 19 #include <linux/kernel.h> 20 #include <asm/page.h> 21 22 /* 23 * Here we define all the compile-time 'special' virtual 24 * addresses. The point is to have a constant address at 25 * compile time, but to set the physical address only 26 * in the boot process. 27 * 28 * These 'compile-time allocated' memory buffers are 29 * page-sized. Use set_fixmap(idx,phys) to associate 30 * physical memory with fixmap indices. 31 * 32 */ 33 enum fixed_addresses { 34 FIX_HOLE, 35 FIX_EARLYCON_MEM_BASE, 36 FIX_TEXT_POKE0, 37 __end_of_permanent_fixed_addresses, 38 39 /* 40 * Temporary boot-time mappings, used by early_ioremap(), 41 * before ioremap() is functional. 42 */ 43 #ifdef CONFIG_ARM64_64K_PAGES 44 #define NR_FIX_BTMAPS 4 45 #else 46 #define NR_FIX_BTMAPS 64 47 #endif 48 #define FIX_BTMAPS_SLOTS 7 49 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 50 51 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 52 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 53 __end_of_fixed_addresses 54 }; 55 56 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 57 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 58 59 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) 60 61 void __init early_fixmap_init(void); 62 63 #define __early_set_fixmap __set_fixmap 64 65 #define __late_set_fixmap __set_fixmap 66 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 67 68 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 69 70 #include <asm-generic/fixmap.h> 71 72 #endif /* !__ASSEMBLY__ */ 73 #endif /* _ASM_ARM64_FIXMAP_H */ 74